The Stovebolt Site Forums The Shop Area Driveline Transmission ID question.

I pulled the engine and tranny from my truck this weekend and havent had a chance to get back to it as I get off of work when the sun has gone down. I managed to get a section of the tranny cleaned enough to snap a pic of a serial number but not of the whole tranny before it got too dark. I'm hoping someone can point me to a site that has tranny ID # info or if ya know what tranny I've got by the number don't be shy just yell it out.

Top has GM10and below that is 591568.
Thanks in advance.

be better to have a pic - is this in the 51? 3 speed or 4? appear to be stock [torquetube] driveline?

Bill

Yeah I've been doing some digging but my google-fu is a little weak, everything I've dug up so far pretty much says to ID it by size, shape and bolt patterns. I'll do what I can to get out to it today before it gets too dark.

Yes it's in the 51, it's a 4 speed and as far as it being stock I couldn't tell ya, not a whole lot on that truck is stock lol.

well if it's on a Chevy engine closed drive, it'll be the early SM420, if open drive, it'll be a post 55 version

Bill

You nailed it red, I shot home for lunch and snapped some pics, came back to work and did some more digging. It's an SM420 with an overdrive between the motor and tranny (don't know what make the overdrive is yet). So now I'm going to start digging for info on how and what these hoses coming off of it were for/how they were routed. Thanks.

overdrive in front of the trans?? hoses on the trans??
you'll hafta get pics up so folks can see what's what, that'd be a highly unique setup

Bill

Looking at it I'm guessing the hose was meant to "circulate" the gear oil between the tranny and OD. I'm almost 100% certain that wasn't my grandfathers doing and was the work of the other family member that liked to bubba things. I'll try and get pics of it up tonight when I hit the house.

Pics are up, they're not the best pics but it was getting dark and I haven't been able to clean it up since this weekend.

duggan,

That is an interesting looking device between the transmission and the engine. I agreed with Bill before seeing that photo. Very interesting

What size V8 is that?

I don't know what that is but it sure must be heavy. If you need the overdrive, I would suggest something a little more modern like a t5, probably 150lbs lighter. Would be interesting to find out what that really is and what it was used on.

wow, bubba really been there what does this linkage do? what does it connect to on the PTO block off plate? what moves it? meaning, which end is driver and which end driven? if an overdrive how is it shifted? really don't see how an overdrive could function before the transmission

is the other end of that hose hooked to the brass plumbing fitting under the back of the trans? how can a single hose provide "circulation"? in fact I can't imagine 90/100 weight gear oil moving thru that small a hose, even warmed up

kinda looks like a hydraulic pump to me, what profession was the service body on the truck for?

Bill

That linkage goes up to the shift lever, it's connected to the overdrive not to the tranny. I guess I shouldn't call it an OD according to what I've read it's more of a gear splitter. I was young when my Gramps was alive and driving that truck so my memories are a bit vague but I remember that truck haulin butt and folks getting mad that the truck was leaving them behind in the steep uphill mountain grades.

The truck was my Grandfathers camping truck, kept it fully stocked with gear and a cab over camper, if he wanted to split for a few days all he had to do was stop at a store and snag food.

I've still got a bit of cleaning to do to see if there are any other markings on the Splitter, I'll try and post up what I find out.

It's a 350

Many years ago my father hauled his bulldozer on a lowboy and the old tractor had a Brownlite or "Brownie" transmission in it but both units had a regular shift lever. I wonder if this is a gearbox with just a high-low range since it just has the one lever. I have seen a second transmission installed backward to give much higher gearing. An example is if second gear was say 3:1 then the input shaft has to turn 3 times to turn the output shaft 1 time but backward turning what had been the output shaft once would then turn the former input shaft (now output) three times. Its been 60 years but I think they used a transmission with spur gears instead of helical gears for the one in backward. My old flatbelt Monarch lathe uses this principle for high and low gearing.

I've heard that term in my search to figure out the specifics but haven't come up with a picture, serial #s, really anything helpful in IDing what I've got. I'm going to be looking at a few tranny shops locally to get my flywheel and stuff resurfaced so I plan on taking it with me to hopefully pick their brains.

I think its probably one of these.

http://www.advanceadapters.com/tech-vault/ranger-overdrive/

Or something similar to it. They have been around for a while, but have never gained popularity.